发明名称 |
Digital current differential system |
摘要 |
A method of detecting faults on a power transmission line system includes simultaneously measuring phase current samples at each phase of each transmission terminal; calculating real and imaginary phaselets comprising partial sums of the phase current samples; for each phaselet, calculating a respective partial sum of squares of each phase current sample; calculating the sums of the real and imaginary phaselets over a variable size sliding sample window; calculating real and imaginary phasor components from the phaselets and a sum of the partial sums of the squares over the sample window; using the sums of the real and imaginary phaselets, the real and imaginary phasor components, and the sum of the partial sums of the squares to calculate a sum of squares of errors between the phase current samples and a fitted sine wave representative of the real and imaginary phasor components; using the sum of squares of errors to calculate a variance matrix defining an elliptical uncertainty region; determining whether a disturbance has occurred, and, if so, re-initializing the sample window; and determining whether a sum of current phasors from each terminal for a respective phase falls outside of the elliptical uncertainty region for the respective phase.
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申请公布号 |
US5809045(A) |
申请公布日期 |
1998.09.15 |
申请号 |
US19960713295 |
申请日期 |
1996.09.13 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
ADAMIAK, MARK GERARD;ALEXANDER, GEORGE EDMUND;PREMERLANI, WILLIAM JAMES;SAULNIER, EMILIE THORBJORG;YAZICI, BIRSEN |
分类号 |
G01R19/25;H02H3/05;H02H3/28;H02H3/347;H02H3/38;H02H3/40;H02H7/045;H02H7/26;(IPC1-7):G06F11/34 |
主分类号 |
G01R19/25 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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